메타데이터
| 항목 |
값 |
| Designation |
48P/Johnson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-08-12T05:28:50.278080Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T09:26:08Z |
| Obs used |
2209 |
| NEO |
- |
| M1 |
9.100 |
| K1 |
16.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-03-18.0000000 |
| e |
0.42708390 |
| q (au) |
2.004538 |
| a (au) |
3.498834 |
| i (deg) |
12.207024 |
| Ω (om, deg) |
110.130831 |
| ω (w, deg) |
216.574132 |
| M (ma, deg) |
32.795970 |
밝기
산란 + 전체 선형
$$
M_a = (8.621 + 5.913\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.621 |
| n |
5.913 |
| gf |
0.997 |
| gb |
-0.880 |
| k |
0.999 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
04:01:48.95 |
+14:26:47.9 |
HIP 18902 |
18.92 |
| 2026-03-26 12:00 |
04:02:22.81 |
+14:29:44.1 |
HIP 18902 |
10.62 |
| 2026-03-27 00:00 |
04:02:56.75 |
+14:32:39.6 |
HIP 18902 |
4.36 |
| 2026-03-27 12:00 |
04:03:30.79 |
+14:35:34.5 |
HIP 18902 |
8.80 |
| 2026-03-28 00:00 |
04:04:04.92 |
+14:38:28.6 |
HIP 18902 |
17.00 |
| 2026-03-28 12:00 |
04:04:39.14 |
+14:41:22.2 |
HIP 18998 |
21.21 |
| 2026-03-29 00:00 |
04:05:13.45 |
+14:44:15.1 |
HIP 18998 |
22.69 |
| 2026-03-29 12:00 |
04:05:47.84 |
+14:47:07.3 |
HIP 19157 |
24.51 |
| 2026-03-30 00:00 |
04:06:22.33 |
+14:49:58.8 |
HIP 19157 |
25.86 |
| 2026-03-30 12:00 |
04:06:56.90 |
+14:52:49.6 |
HIP 19261 |
20.13 |
| 2026-03-31 00:00 |
04:07:31.55 |
+14:55:39.8 |
HIP 19261 |
14.33 |
| 2026-03-31 12:00 |
04:08:06.29 |
+14:58:29.3 |
HIP 19261 |
12.73 |
| 2026-04-01 00:00 |
04:08:41.11 |
+15:01:18.1 |
HIP 19261 |
16.61 |
| 2026-04-01 12:00 |
04:09:16.01 |
+15:04:06.2 |
HIP 19499 |
22.86 |
| 2026-04-02 00:00 |
04:09:50.99 |
+15:06:53.7 |
HIP 19499 |
14.10 |
| 2026-04-02 12:00 |
04:10:26.06 |
+15:09:40.4 |
HIP 19499 |
5.80 |
| 2026-04-03 00:00 |
04:11:01.20 |
+15:12:26.5 |
HIP 19499 |
5.20 |
| 2026-04-03 12:00 |
04:11:36.43 |
+15:15:11.8 |
HIP 19499 |
13.42 |
| 2026-04-04 00:00 |
04:12:11.73 |
+15:17:56.5 |
HIP 19617 |
21.99 |
| 2026-04-04 12:00 |
04:12:47.11 |
+15:20:40.4 |
HIP 19617 |
26.06 |
| 2026-04-05 00:00 |
04:13:22.57 |
+15:23:23.6 |
HIP 19822 |
31.59 |
| 2026-04-05 12:00 |
04:13:58.10 |
+15:26:06.2 |
HIP 19822 |
23.66 |
| 2026-04-06 00:00 |
04:14:33.70 |
+15:28:48.0 |
HIP 19822 |
16.81 |
| 2026-04-06 12:00 |
04:15:09.39 |
+15:31:29.1 |
HIP 19877 |
11.58 |
| 2026-04-07 00:00 |
04:15:45.14 |
+15:34:09.5 |
HIP 19862 |
8.68 |
| 2026-04-07 12:00 |
04:16:20.97 |
+15:36:49.2 |
HIP 19862 |
12.68 |
| 2026-04-08 00:00 |
04:16:56.87 |
+15:39:28.1 |
HIP 19862 |
20.25 |
| 2026-04-08 12:00 |
04:17:32.84 |
+15:42:06.4 |
HIP 20082 |
25.74 |
| 2026-04-09 00:00 |
04:18:08.89 |
+15:44:43.9 |
HIP 20082 |
20.72 |
| 2026-04-09 12:00 |
04:18:45.00 |
+15:47:20.7 |
HIP 20205 |
17.90 |
| 2026-04-10 00:00 |
04:19:21.18 |
+15:49:56.7 |
HIP 20205 |
13.82 |
| 2026-04-10 12:00 |
04:19:57.43 |
+15:52:32.0 |
HIP 20290 |
14.23 |
| 2026-04-11 00:00 |
04:20:33.75 |
+15:55:06.6 |
HIP 20290 |
5.15 |
| 2026-04-11 12:00 |
04:21:10.13 |
+15:57:40.5 |
HIP 20290 |
4.03 |
| 2026-04-12 00:00 |
04:21:46.59 |
+16:00:13.6 |
HIP 20290 |
13.13 |
| 2026-04-12 12:00 |
04:22:23.10 |
+16:02:45.9 |
HIP 20389 |
16.72 |
| 2026-04-13 00:00 |
04:22:59.69 |
+16:05:17.5 |
HIP 20485 |
20.44 |
| 2026-04-13 12:00 |
04:23:36.33 |
+16:07:48.4 |
HIP 20485 |
22.18 |
| 2026-04-14 00:00 |
04:24:13.04 |
+16:10:18.5 |
HIP 20605 |
19.70 |
| 2026-04-14 12:00 |
04:24:49.81 |
+16:12:47.9 |
HIP 20661 |
19.92 |
| 2026-04-15 00:00 |
04:25:26.65 |
+16:15:16.5 |
HIP 20661 |
18.98 |
| 2026-04-15 12:00 |
04:26:03.54 |
+16:17:44.3 |
HIP 20661 |
22.19 |
| 2026-04-16 00:00 |
04:26:40.50 |
+16:20:11.4 |
HIP 20741 |
24.63 |